I keep getting these 'XSRF Security Token' errors in stash. They usually appear in sessions that have been around a while (maybe an hour or so). Refreshing the browser will take care of it, but it might come back on the next operation. Loggin out and logging in again seems to fix it for a while. Our Stash instance is using a Jira external directory for the user directory. What would be causing this? How can I fix the configuration to keep this from happening?